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Previously SimplifyInstruction could report that an instruction

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simplified to itself (this can only happen in unreachable blocks).
Change it to return null instead.  Hopefully this will fix some
buildbot failures.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119490 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2010-11-17 08:35:29 +00:00
parent ce1b9ad539
commit d261dc650a
3 changed files with 32 additions and 19 deletions
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3
lib/Analysis/Lint.cpp
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@@ -616,8 +616,7 @@ Value *Lint::findValueImpl(Value *V, bool OffsetOk,
// As a last resort, try SimplifyInstruction or constant folding.
if (Instruction *Inst = dyn_cast<Instruction>(V)) {
if (Value *W = SimplifyInstruction(Inst, TD, DT))
if (W != Inst)
return findValueImpl(W, OffsetOk, Visited);
return findValueImpl(W, OffsetOk, Visited);
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
if (Value *W = ConstantFoldConstantExpression(CE, TD))
if (W != V)